LEGUMINOSAK (PEA FAMILY) 283 



Leaves glabrate; pods glabrous . . . 64, A. hylophilus. 

 Leaflets linear to filiform, cinereous or silky; 

 pod broad-linear, hoary or silky pubescent. 

 Leaflets linear ...... 65. A. decumbens. 



Leaflets lance-oblong .... 66. A. pauciflorus. 



Plants taller (2-5 dm.), scarcely tufted. 



Steins rusS-like; lateral leaflets linear, often 



wanting 67. A. diversifolius. 



Stems leafy; leaflets obloD^-linear . , . 68. -A. Wingatensis. 

 Pods subterete; stipules distinct or nearly so. 

 Calyx gibbous at base; leaflets oblong . . . 69. A. Hallii. 

 Calyx not gibbous at base. 

 Stems ascending or spreading. 



Green;racemeselongated;podsl5-25mm.long 70. A. flexuosus. 

 Cinereous; raceme subcapitate; pods 7-10 mm. 



long 71. A. Bodinii. 



Stems erect. 



Pods sessile 72. A. Fendleri. 



Pods large, exsert-stipitate ... 73. A. lonchocarpus. 



Low caespitose plants with palmately 3-foUolate leaves (OB.OPH- 

 ACA) 



Flowers ocbroleucous 74. A. triphyllus. 



Flowers purple. 

 Raceme sessile, shorter than the leaves . , , . , 75. A. tridactyljcus. 

 Kaceme short-peduncled, exceeding the leaves . . . 76. A. sericoleucus. 



1. Astragalus succulentus Rich. Frank. Journ. 746. 1823. Stems prostrate- 

 spreading from the crown of a woody caudex, 1-3 dm. long, finely strigose: 

 leaflets green, 15-25, 10-15 mm. long, elliptic-oblong, obtuse: raceme short, 

 on a peduncle 3-10 cm. long: calyx slightly gibbous, somewhat dark-strigose 

 especially on the teeth: corolla ochroleucous, ^ith purple-tipped keel, 20-35 

 inm. long; the narrow standard deeply notched at apex: pod 2-celled, fleshy, 

 indehiscent, plimi-shaped and about 2 cm. long at maturity. A. caryocarpiis 

 in part. (A. prunifer Rydb. Mem. N. Y. Bot. Card. 1: 239. 1900.)— Plains 

 and foothills; Colorado'to Canada. 



2. Astragalus crassicarpiis Nutt. in Fras. Cat. 1: 1813. Size and habit of 

 the preceding, pale and niihutely appressed-pubescent: leaflets narrowly 

 oblong: flowers m a short spike-like raceme: corolla violet-purple: pod gla- 

 brous, ovate-globular, more or less abruptly pointed, 20-25 mm. long, very 

 thick-walled, succulent but .cellular or corky when dry. A. caryocarpus in 

 part. — Colorado eastward on the plains dnd thence to Minnesota and Texas. 



3. Astragalus moUissimus Torr. Ann. Lye. N. Y. 2: 178. 1828. Stems 

 rather ^tout, mostly ascending from a decumbent base, the whole plant 

 densely siUcy-villous and tomentose: leaflets 17-29, ovate-oblong: spikes 

 dense, on elongated peduncles: calyx tubular: corolla violet, 12-20 mm. long: 

 pod glabrous, dry> coriaceous, dehiscent, narrowly oblong, obcompressed and 

 sulcate at both sutures, at length incurved, 10-18 mm. long. {A. anisiis 

 Jones,Zoe4: 34. 1894.) — Wyoming and Nebraska to Kansas and New Mexico; 

 one of the several Loco weeds. 



4. Astragalus Bigelovii Gray, PL Wright. 2: 42. 1853_. Densely lanate- 

 villous throughout: stems stoutish, ascending; 1-3 dm. high: leaflets 15-25, 

 oval to obovate-oblong, 10-15 mm. long: , spike crowded, long-peduncled: 

 calyx-tube cylindrical, villous: corolla purple, 12-16 mm. long: pod turgid, 

 ovate, acute, not sulcate at the sutures, densely lanate. — Colorado to New 

 Mexico and Texas. 



5. Astrag;alus carolinianus L. Sp. PL 756. 1853. A glabrate or puberu- 

 lent perennial: stems erect, 3-10 dm. high, often striate: leaflets 11-29, oval 

 to oblong, usually glabrous above and white-pubescent beneath: flowers 

 10-15 mm. long, becoming horizontal or reflexed: spikes long and dense, pe- 

 duncled: calyx cylindrical, with subulate teeth: corolla ochroleucous or green- 

 ish: pod oblong or elliptical, nearly erect, 10-15 mm. long, glabrous, 2-celled. 

 (A. oreophilus Rydb. Bull, Torr. Bot. Club 31: 561. 1904, and A. colora- 

 densis Rydb. seem to be merely variations of the widely disseminated A. 

 canadensis L., which may or may not be specifically distinct from A. carolinv- 

 amis L.) 



6a. Astragalus carolinianus Mortonii Wats. King's Rep. 68. 1871. Usu- 



